hanger question

obviously this is the SS forum but, maybe one of two of you have thought about this.I've been running SS for a few years now,love it, great change of pace compared to riding DH,but recently I've been missing my gears.

Question is, are there any sort of axle or hub or frame mounted hangers out there for SS only frames?

A lot of frames have replaceable bolt-on dropouts for the back wheel, but I think that is mostly for Ti and Aluminum frames. If your bike has replaceable dropouts you could probably get one with a hanger. An example is Moots: http://www.universalcycles.com/shopp...s.php?id=31969